Oscillograph



FIG. 1 is a bottom plan view of a new design for an oscillograph;

FIG. 2 is a perspective view from above and to the front right sidethereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a perspective view from below and to the front left sidethereof;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a rear elevation view thereof.

CLAIM The ornamental design for an oscillograph, as shown and described.